SFP transceivers are available with a variety of transmitter and receiver types, allowing users to select the appropriate transceiver for each link to provide the required optical reach over the available optical fiber type (e.g. multi-mode fiber or single-mode fiber). Optical SFP modules are commonly available in several different categories:
>>for multi-mode fiber, with black or beige extraction lever
SX – 850 nm, for a maximum of 550 m at 1.25 Gbit/s (Gigabit Ethernet) or 150m at 4.25 Gbit/s (Fibre Channel)
SX – 850 nm, for a maximum of 550 m at 1.25 Gbit/s (Gigabit Ethernet) or 150m at 4.25 Gbit/s (Fibre Channel)
>>for single-mode fiber, with blue[1] extraction lever
LX – 1310 nm, for distances up to 10 km
BX – 1490 nm/1310 nm, Single Fiber Bi-Directional Gigabit SFP Transceivers, paired as BS-U and BS-D for Uplink and Downlink respectively, also for distances up to 10 km
1550 nm 40 km (XD), 80 km (ZX), 120 km (EX or EZX)
CWDM and DWDM transceivers at various wavelengths achieving various maximum distances
LX – 1310 nm, for distances up to 10 km
BX – 1490 nm/1310 nm, Single Fiber Bi-Directional Gigabit SFP Transceivers, paired as BS-U and BS-D for Uplink and Downlink respectively, also for distances up to 10 km
1550 nm 40 km (XD), 80 km (ZX), 120 km (EX or EZX)
CWDM and DWDM transceivers at various wavelengths achieving various maximum distances
>>for copper twisted pair cabling
1000BASE-T – these modules incorporate significant interface circuitry and can only be used for Gigabit Ethernet, as that is the interface they implement. They are not compatible with (or rather: do not have equivalents for) Fibre channel or SONET.
1000BASE-T – these modules incorporate significant interface circuitry and can only be used for Gigabit Ethernet, as that is the interface they implement. They are not compatible with (or rather: do not have equivalents for) Fibre channel or SONET.
>>Divided by rate: 155M/622M/1.25G/2.125G/4.25G/8G/10G,155M and 1.25G market is used more, 10G technology is maturing, demand is to increase quickly.
>>Divided according to the wavelength: 850 nm/1310 nm/1550 nm/1490 nm/1530 nm/1610 nm.
The 850 nm wavelength is SFP multimode, and the transmission distance is 2 km below .
1310/1550 nm is SFP single-mode, and the transmission distance is longer than 2 km.
850 nm/1310 nm/1550 nm price relatively cheaper than the other three.
The bare module is easy to confuse if they have no mark,the manufacturers will make the color of pull ring to distinguish generally, For example:
>>Black pull ring is multi-mode, the wavelength is 850 nm;
>>Blue is the 1310 nm module;
>>Yellow is the 1550 nm module ;
>>Purple is the 1490 nm module and so on.
SFP, with its small and low-cost advantages to meet the equipment needs of high-density optical modules has become mainstream.
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